Tire-gage.



No. 794,081. PATBNTED JULY 4:, 1905.. J. E LEHMAN.

TIRE GAG-E APPLIUATION FILED MAY 3,1805.

8 M F IQZ SYN-N 555:5, INVENTQR no. reaper.

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latented July 4t, 1905.

JAY E. LEl-lhlilll, OF REV1ltLt3l()KE, CANADA.

"ll' ll it E Edit-Ti EalPEGIFlECATION forming part of Letters Patent No.794L031, dated July 41:, 1905.

Application filed May 3, 1905- Serial No. 258.731.

To all 1072/0112, it many eon/007 71,:

Be it known that I, JAY E. LnuMAN, a citizen of the United States ofAmerica, residing .in the city of .ltevelstoke, in the Province ofBritish. Columbia, Canada, have invented a new and useful Improvement inTire-Gages, of which. the follown'lg is a specification.

My invention relates to a gage whereby the wear of a railway-wheel tiremay be determined that it may be ascertained whether the limit wear oftread or flange is approached or has been exceeded; and my object hasbeen to obtain such measurements in a convenient and accurate mannerfrom a position which not affected by the wear of the tire. Thedilliculty GXPGliOTlCOLl. heretofore with such gages has been. that asthe whole outer diameter of the tire, whether of flange or tread, is toa greater or less extent subject to wear no part of such outer diameteraffords a satisfactory base from which to measure the wear and, further,that the gages hitherto used have not been susceptible of application totires of various dimensions, nor have they beenv designed to ascertainon one gage the wear of the flange and the wear of the tread of thewheel. I. have therefore designed my gage that the wear may be measuredfrom a member which projects across the width of the tire square to altlel'l'lbcl which may be set against the outer face of the tire-rim,which is to be regarded as the base on which the gage is set to insurethe correct position of it in relation to the tire. The end of themember which projects across the width of the tire is rounded to aradius indicating the limit of wear which is permissible on the filletof the flange, and slidable along the length of this member is adepth-gage by which the wear of the tread of the wheel may be determinedat any desired position across the width of the tire.

The particular construction and application of the gage is fullydescribed in the following specification and illustrated in the drawingswhich accompany it, in which- Figure 1 is a front elevation. of thegage, showing its application to the cross-section of a flanged tire;Fig. 2, a section through the gage on the line A A in Fig. 1 Fig. 3, anend elevation from the left-hand side, and. Fig. a is a section on theline B B in Fig. 1.

.In the drawings, T TUPFGSGTItS the cross section of a flanged tire towhich the gage is shown as applied.

2 the base member designed. to be applied to the outer face of the tireand having a portion 2;} removed to clear any turned-over or raggedcorner edge. Across the back of 2 toward its upper end a portion lprojects, (see Fig. 2,) the edges of which are square to that edge of 2which is designed to be set against the outer face of the tire, and thispro j ection l slidably l its into an elongated slot 5, extendingthroughout the greater part of the length of a cross member 6, which islong enough to reach across the width of a railway-wheel tire, whether'l'langed or otherwise. The cross member 6 is retained in slidablecontact with the face of the base member 2 and may be clamped in anydesired lengthwise position .in the slot 5 by a washer? and milledhead-screw 8, applied at the back. The lower corner of the extreme outerend of 6 is rounded, as at 9, to a curvature representing the limit ofwear permissible on the .[illet of the tireflange, and the edge of thiscurve 9 is graduated to facilitate the location of the wear of theflange it may be set against. The dge of the base member 2 being setagainst the outer face of a tire in the manner indicated in Fig. 1 andthe screw 8 slackened, the member 5 may be extended until its endcontacts with the flange and the condition of the wear of the filletdetermined. Slidably movable in the same slot 5 of the cross member 6 isa gage-block 10, having a backward projection 11. to engage the edges ofthe slot, and this gage-block is retained against the face of G and maybe clamped in any desired position along the slot 5 by a washer 12 andmilled head-screw 13 in the same manner as is used to secure the crossmember 6 to the base member 2. Vertically slidable in a recess in theface of this block 10 is a gage member 14, having an elongated slot 15to permit of endwise movement on the milled l.i.eadscrew 16, by whichthe gage member may be secured.

to the block. The gage-block may thus be traversed along the bar 6across the width of the tire opposite to the greatest wear of the tread,and being clamped there by the screw 13 the gage member 141 may bepushed down to contact with the tire and be secured by the screw 16.

Slidable lengthwise in a recess 20 in the face of the member 2 is agage-slide 21, having an elongated slot 22 to clear the milledhead-screw 23, by which it may be clamped in any desired position ofextension, and at the lower end of this slide 21 is a gage-point 2 1,slidable in a drilled aperture across the end of 21, the end of theslide being split to afford a resilient frictional grip to the gagepoint24:. The gage member 21 may thus be extended out of the base member 2and the gage-point 24 set to the joint of the inner diameter of thetire.

To facilitate the determination of the position of the wear, the face ofthe bar 6 may be graduated, as shown in Fig. 1, and the faces of 2 and10 may be similarly graduated along the edge of the gage-slide recesses,so that the depth of wear below the face of the tire will be indicatedby the graduations of 10, and the extreme thickness of the tread of thetire will be indicated by the graduations of 2, and on the formermeasurementbeing deducted from the latter the minimum thickness of thewheel-tread may be ascertained.

Across the face of 6 at the termination of its groove 5 is a shallowrecess 26, designed to receive the cross projection 4 of the member 2and permit it to be secured along the member 5 for greater convenienceof portability when the gage is not in use.

In addition to the general convenience of this gage and the facility bywhich measurements may be determined by it an important feature in itsdesign is that the measurements of wear are determined from a base whichis unaffected by the wear of the wheel, and thereforereliable.Fillet-gages for determining the wear of the flange are frequentlyineffectual by reason of the .fact that they cannot conveniently beapplied square to the plane of rotation of the wheel.

Having now particularly described my invention and the manner of itsuse, I hereby declare that what I claim as new, and desire 'to beprotected in by Letters Patent, is

1. In a wheel-tire gage; the combination with a base member designed tobe set against the outer face of a wheel-tire, of a cross-bar laterallyextensible therefrom at right angles to the contacting edge of the basemember, a gage-block endwise slidable along the crossbar, and adepth-gage slidable on the block at right angles to the edge of thecross-bar.

2. In a tire-gage; the combination with a base member designed to be setagainst the outer face of the wheel-tire, of a gage-bar endwise slidablein relation to the base mem ber in a direction parallel to itscontacting edge and having a gage-point endwise slidable across its endat right angles to the direction of its movement, a cross-bar slidableacross the upper end of the base portion at right angles to thecontacting edge thereof the extreme lower corner of which is rounded tothe smallest permissible curve of wear of a wheelflange, and agage-block slidable along the cross-bar having a gage member slidable onthe block at right angles to the edge of the bar.

3. In a tiregage; the combination with a base member designed to be setagainst the outer face of a wheel-tire, of a cross-bar laterallyextensible from the base member at right angles to it, means forclamping the cross-bar to the base member at any desired osition oflateral extension, a gage-block slidable along the cross-bar having agage member slidable in the block at right angles to the edge of thebar, means for clamping the gage-block to the bar, and means forclamping the gage member to itsblock.

4. In a tire-gage; the combination with a base member the edge of whichis designed to be set against the outer face of a wheel-tire, of agage-bar endwise slidable in relation to the base member in a directionparallel to its edge of contact on the tire and having a gagepointendwise slidable across its end, graduations to indicate the amount ofextension of the gage-bar in the base portion, a graduated cross-barslidable across the upper end of the base portion at right angles to thecontacting edge thereof the extreme lower corner of which is rounded tothe smallest permissible curve of wear of the tire-flange and isgraduated on such curve from the under edge of the bar, and a gage-blockslidable along the cross-bar having a gage member slidable in the blockat right angles to the edge of the bar, the gage-block havinggraduations to indicate the movement of the gage-bar in relation to theblock.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

J AY E. LEHMAN.

Witnesses ROWLAND BRITTAIN, ELLIOE M. WEBBER.

ITO

